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Finding the Fourth Proportional to 28,668.79, 43,009.15 and 8,679.40

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Solution

The fourth proportional to 28,668.79, 43,009.15 and 8,679.40 is: 13,020.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,668.79 : 43,009.15 = 8,679.40 : x
  2. Step 2: Convert to fraction form
    28,668.79/43,009.15 = 8,679.40/x
  3. Step 3: Cross multiply
    28,668.79x = 43,009.15 × 8,679.40
  4. Step 4: Simplify right side
    28,668.79x = 373,293,606.35
  5. Step 5: Solve for x
    x = 373,293,606.35/28,668.79
  6. Step 6: Final answer
    x = 13,020.90

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.